Raw water (pure water) is delivered to water tank. It goes through
valve via the pipe and is fed to H2 and O2 tower by complementary
pump. Then it goes through H2 and O2 separator in lower part of the
pipe and through alkali liquid recycling pump , alkali liquid
filter to electrolyzing tank. H2 and H2 are obtained by
electrolyzing. O2 and H2 through pipe to alkali liquid for cooling
and H2 and O2 separator comprehensive column cooling and washing(H2
needs to be cooled further). Moisture is separated through
water-gas separator and goes through water discharger to be
drained. O2 through O2 pipe goes to adjusting pipe to be delivered
out. According to customer’s requirement to be vented or stored. H2
from H2 comprehensive column and delivered after adjusted.

Cooling water of system is mainly supplies electrolyzer , silicon
rectifier penal , and for water sealing purpose for the tank.

Pure water in electrolyzing tank is decomposed under DC action. In
the cathode and anode plates in cabin H2 and O2 are created
separately which flow out of the two poles in electrolyzing tank in
the cabin with alkali liquid.

Through external pipes they go together and enters alkali liquid
separator. H2 an O2 in the middle of separator (under alkali liquid
surface) under gravity ,H2 (O2 ) and alkali liquid descends
separately to separate H2(O2) which is cooled on the upper part of
the separator and washed. H2,O2 remove the dropping liquid on the
top of the separator and O2 is vented to the atmosphere after
adjusted valve. H2 is further cooled through comprehensive column
to be saturated to gas-water separator for removal of dropping
liquid. It is adjusted by pneumatic valve to Frame I.

4.2.2 Alkali liquid recycling system (alkali liquid recycling )

H1 and O2 from electrolyzing tank in alkali liquid under gravity in
separator they separate into H2 and O2.IT is cooled down in lower
part of separator. They (two branches) flow into alkali liquid
recycling pump. Pump provides the energy for alkali liquid
recycling.. We adopt recycling pump to ensure the stable operation
for the whole system. Alkali liquid goes through filter which
removes the mechanical impurity by asbestos cloth to lower part of
electrolyzing tank. It goes evenly through pipes to be distributed
to each electrolyzing cabin. Electrolyzing liquid flows to each
small cabin (between two poles) from lower part to upper part to be
electrolyzed so that form inner recycling system in electrolyzing
liquid.

4.2.3 Water complementary system:

Raw water is complemented by water supplementary pump to
comprehensive column through washing sector to wash H2 or O2.
Washing sector is water of sealed structure. Extra complementary
water through flooding pipe to lower part of separator with alkali
liquid to alkali liquid to alkali liquid recycling system to
achieve purpose of water supplementary. Water pump working is
interrupted which start and stop is controlled by alkali liquid
surface for H2 and O2 separation.

4. 2.4 Cooling water supply system

It is divided into two branches,one through pneumatic diaphragm
adjusting valve into H2 (O2) alkali liquid cooler cooling recycling
alkali liquid so as to control system working tempt. purpose and
another separately into H2(O2) comprehensive column to cool the
H2(O2).

4.2.5 Nitrogen system

This equipment has nitrogen filling opening pipe, through valve in
alkali liquid conflux pipe of H2 and O2 separator to fill the
system with nitrogen for blowing out and gas tightness at starting.

Blow up and gas tightness test when the system first start and
after repair.

Blow up and gas tightness test when H2 tank first start or after
repair.

H2 generating equipment consists of electrolyzing tank and Frame
I., alkali liquid after filtering is filled to electrolyzing tank.
When it is full, alkali liquid goes to H2(O2) separator. It is fit
for starting.

Raw water is sucked with alkali liquid. It is fit when the system
is under washing. 4.1.8 Alkali dosage system

Raw water in alkali tank is recycled by alkali pump. It goes
through alkali filter, valve to be switched to alkali tank. During
raw water recycling, add potassium hydroxide regularly which is not
easy to be solved so that dosing alkali recycling(outside
recycling) is formed. This work is executed when the equipment
starts.

4.3. Description of the control system:

4.3.1,The supplier will provide PLC for hydrogen production system with
full automatic operation. Which has auto stop and auto inspection
and control. Each stage has warning, interlock function. It has one
button to auto level. It also has manual operation function. When
PLC has fault, system manual operation ensures the system to
produce the hydrogen continuously.

4.3.2 Control system circuit and parameter collect point for
hydrogen production

4.2.3. Pressure control system

Through pressure transformer at O2 separator side, pressure is
measured and translated to DC signal of 4~20 mA to LC,by comparison
with set value and PID calculation, and by electrical switcher to
revert to 0.02～0.1MPa electric signal so as to control the opening
of pneumatic diaphragm valve to obtain pressure stability of the
system. System pressure is set on man-machine screen.

4.2.4 Liquid level control system

a. H2 separator level control

In process of electrolyzing, raw water is continuously consumed so
that the level of water at O2 separator is continuously reduced.
Thus it must be complemented by water complementary pump so as to
satisfy the consumption of water.

Liquid level is measured through pressure differential transformer
at the H2 side which is translated to standard 4～20mA electric
signal to PLC； Through comparison of set upper and lower liquid
level limitations for warning and interlock to create signal to
control start and stop, and interlock warning of the complementary
pump. Upper and lower liquid level limitations for warning and
interlock can be set on man-machine screen.

b. Pressure differential control at H2 and O2 sides

This system can control pressure balance at H2 and O2 sides.
Pressure differential of gas and liquid phases is measured by
pressure differential transformers at the O2 separator side and at
the H2 separator side. Two 4～20mA measured signal are transferred
to PLC and through PID calculation (P:proportion,I:integral
D:differential coefficient(selectable)normal operation)The
operation result is inputted to electric reverser to 0.02～0.1MPa
electric signal to control the opening of the pneumatic adjusting
valve on H2 outlet pipe so as to control the pressure balance at
the two sides.

Control frame process diagram :

4.2.5 Tank tempt. control system

Working tempt. of electrolyzing tank is a important parameter for
the equipment. It is approved that when gas output, environment
tempt. and alkali quantity is fixed, the tempt. of electrolyzing
tank is in proportion to recycling alkali tempt. We could adjust
the recycling alkali tempt. to control the tank tempt. The tempt.
transformer is installed on O2 separator side and the output signal
is transformed to PLC,and is compared with tank set value in PLC
and is calculated by reaction PID operation. Then signal is
transferred to electric reverser to create 0.02～0.1MPa signal to
adjust the opening of the cooling water pipe so as to control
recycling alkali liquid tempt.. We use our control method in
accordance with our year’s experience to adopt tandem PID control
method of H2 production system tempt. contrl.

4.2.6 Important parameter measuring points of hydrogen production
system

Pressure in the system

O2 liquid level

H2 liquid level

Alkali tempt.

H2 and O2 tempt. differential

O2 tank tempt.

H2 tank tempt.

Alkali liquid recycling capacity

H2 content in O2 out of electrolyzing tank

O2 content in H2 out of the electrolyzing tank

Rectification panel current

4.2.7．PLC system

PLC structure

PLC is matured technology with stable operation from German SIEMENS
or Japanese OMRON products. It consists of CPU, input and output
module for simulation, power supply module (E2PROM,separation transformer ), etc.

Hangzhou Tailian Cryogenic Equipment Co., Ltd is a joint venture
enterprise specializing in the production of cryogenic equipment,
which is the subsidiary company of Tai Wan Lian Su group.
Registered capital is 10,000,000 Yuan (about 1,600,000 USD ).
Founded in 1996, Tailian has been doing research and development
for various technologies, manufacturing of equipment, sales and
service in the filed of cryogenics in both domestic and foreign
markets. Owning advanced technology and producing facilities, we
also have dozens of experienced specialists for cryogenic and air
separating area for years. Tailian has been the supplier of dozens
of world famous transnational companies, such as China nuclear
power engineering Co., Ltd, China Aerospace Science and Technology
Corporation, Xinjiang Guanghui Industry Investment Group Company
Limited, Sinopec Group, China National Petroleum
Corporation（CNPC）, Linde Group, France Air Liquid, China
National Offshore Oil Corporation, Coca-Cola,Praxair，Hang Yang
Group, Pepsi, Wahaha Group, Hafei Aviation Industry Co., Ltd, ENN
Energy Holding Group, Qingdao Beer, Budweiser, Shell, CIBA and
B.O.C. etc. Our annual producing capability of liquid pump is round
800-900 sets, and so far we have finished more than 10,000 sets
cryogenic liquid pumps to the customers. In the past few years, our
productions have been exported to several countries, such as
Vietnam, Kazakhstan, Pakistan, Congo, Bangladesh, Egypt, Iraq,
Cambodia, Angola, Philippines, India, Venezuela, Indonesia and Lao,
etc.

Tailian has got the special equipment manufacturing license
(A-grade pressure pipes) of People’s Republic of China and approval
certificate of ISO9001：2008. Tailian is one of the members in 30
companies who got the title of ‘Golden Reputation’ in the First
China Integrity Network Summit. And We are also the member “ Union
of Golden Reputation”. With advanced technology, superior quality
and value of after sale service, Tailian earns trust from lots of
transnational gas companies both at home and abroad.

Sharp tools make good work. The administrator of Tailian realized
that only good management, idea or good talent are not enough.
Advanced facility must be adopted to ensure powerful manufacturing
prowess and superior quality of our products. We purchased world
advanced producing facilities(such as process center and CNC) and
have experienced specialists, which can guarantee the good quality
of products.

Our company persists in the principle of customer first, sincere
service, products sale over the country, and export to Southeast
Asia and the Middle East. Our products are mainly used in
petroleum, chemical, nuclear power plants, iron and steel, electric
power, military, aerospace and other industries.